"Ultimately we want to do anything we can to lower the road toll so the message has to be clear that, as of May 20, if you are breathalysed with a low range, you will have an immediate three-month suspension."

Mr Constance said alcohol-related crashes killed at least 68 people on NSW roads last year, accounting for nearly one in five road deaths, including 55 lives lost on country roads.

Fatalities from crashes involving a drug-driver accounted for similar numbers of deaths, he said.

Under the new laws, the penalties for drug-drivers will also be simplified.

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Offenders who drive with the presence of illicit drugs will receive a $561 fine and a three-month licence suspension if the offence is confirmed by laboratory analysis.

NRMA spokesman Peter Khoury told reporters today, "For far too long, too many people who have been caught drink-driving, or driving with drugs in their system, have been able to go get themselves a good lawyer, head off to court and get off without even a slap on the wrist.

"This is about re-enforcing and supporting the work that police are doing on the roads."

The NSW change mirrors laws introduced to Victoria in April 2018.

When asked about the level of public awareness of the new laws, Mr Khoury said the NRMA ran the first drink-driving education campaign in the 1980s "and we're still here talking about it".

"People shouldn't have to wait for a change in the rules to not get behind the wheel when you're drunk, it shouldn't come down to the government having to introduce tougher penalties," he said.

When announcing the new regime earlier this month, Assistant Police Commissioner Michael Corboy said the new reforms would protect all road users by ensuring "swift and certain penalties".

"Alcohol is one of the major factors in crashes that kill or injure people on NSW roads.The .05 blood alcohol limit has been in place for almost 38 years. There are no more excuses," he said.

Assistant Commissioner Corboy said most drink-driving deaths were in regional NSW, largely western and northern NSW.

He said the new regime would also allow police to spend less time preparing matters for court.

"For us, this really gives us some consistency across the state," he said.